Indicating mechanism.



. MIDGLEY, je,

Mmmm; MECH/msm.

APPLCAHOH FILED AUG.21,19I2.

Mmm May 2, my:

T. MIDGLEY, III.

INDICTING MECHANISNI.

APPLICATION FILED AuG.2I. i912.

Patented May 2, 1916f IIs-1,239.

2 SHEETS-SHEET-Z.

willi/lll 'lA-1 1! UNiTED STATES PATENT oFFIoE.

THOMAS MIDGLEY, JR., 0F DAYTON, OHIO, ASSIGNOR TO THE NATIONAL CASH REG-ISTER COMPANY, 0F DAYTON, OHIO, A CORPORATION OF OHIO, (INCORPORATEDINDICATING MECHANISM.

Specification 'of Letters Patent.

Application iled August 21, 1912. Serial No. 716,142.

1/ 'o MZ whom it may concern:

Be it known that I, T HoMi-is MinoLiiY, Jr., a. citizen of the UnitedStates'residing at Dayton, in the county of Montgomery and State ofyOhio, have invented certain new and useful Improvements in IndicatingMechanism, of which I declare the following to be a full, clear, andexact descrip-v tion.

This .invention relates to key operated Cash registers and particularlyto the differential mechanism of suchy machines and the connections forsetting the indicators and actuating the counter therefrom.

Among the objects of the invention is to eliminate ,as far as possiblethe danger ot overthrow of the counter pinions and indicators inmachines of this class; to provide in such machines for adjustingoscillatory indicator units from one position directly to any otherwithout -irst returning them to a constant position: to provide apositive Stop for the indicators when the latter reach positionsdetermined by the keys,

set will serve to insure the indicator for the set in which no key isdepressed indicating '/.ero after the operation.

lrielv the above objects are accomplished iii the embodiment hereindisclosed by mounting for cooperation with the keys of eachdeiioiiiinational set two frames stepped compleinentarily. correspondingsteps of which cooperate with the respective keys when the latter aredepressed to be moved ditl'erentiallv thereby. (')ne ot' the frames ofeach set is provided with gear teeth Jf'or actuating the correspondingcounter pinion and this traine is elevated differentially by the keys inaccordance with the numerals on the keys b v means ot' the steppedarrangement ol" the liaine ditl'erentially to operate the counterpinion. The other Atrame being stepped complementarily to the counter:ic--

tuating one is elevated the complement ot' the extent the lirstmentioned one is elevated. oth of these frames pivotally carry links theopposite ends ol' which have pins and through the positivev limitingmeans for the playing i'n arcuate slots in oscillatory disks toothed ona portion of their periphery to engage with pinions on their indicatorunits which are thus adjusted in accordance with the adjustment of thedisks. lVhen the indicators are at zero the pins 011 the links are atthe for vard ends ot' their arcuate slots and differential adjustment ofthe link connected with the counter actuating frame will, by its pinengaging the upper end of its slot in the disk, rotate the latter andthe connected indicator in accordance with the movement of the framewhich actuates the counter pinion. The pin on the other link being onthe opposite side of the axis of the' disk, when elevated will moverearwardly and upwardly with respect to its slot until the desiredadjustment ot' the disk results, when it is then in engagement with theupper end of its slot and positively prevents any further movement ofthe disk and its connected indicator. lVhen the indicator is to beadjusted from a lower to a higher position it is moved by the linkconnected with the counter actuating trame and the other link positivelylimits the movement of the disk while if the. indicator is to beadjusted from a higher to a lower position the movement is accomplishedby the other link and frame which moves the indicator disk reverselv toproper position the first mentioned link limit-ing the reverse-movementof the disk and indicator. The lengths of the slots correspond to thedistance the indicatoi' disks move in going from their zero to theirnine positions, and at the moment an adjustment of an indicator iscompleted the pins on the links are always at the upper ends of theirslots.

To provide for adjusting the indicators to zero when no key ot' theircorresponding sets is depressed, a member taking the place of a zero keyis provided for each set of keys, which is normally in the path of theke)T coupler but is withdrawn Jfrom such path whenever a key of its setis depressed and coupled with the kev coupler. This member cooperateswith the stepped trames so as to not move the counter actuating one, butto move the other traine nine steps which thus insures the return ot'the indicator and disk ot' onel set of keys to zero position wheneverthe machine is operated with no key of the set depressed.

With these and incidental objects in View, the invention consists incertain novel features of construction and combinations of parts, theessential elements of which are set forth in' appended claims, and apreferred form of embodiment of which is hereinafter described withreference to the drawings which accompany and form part of thespecification.

Figure 1 is a vertical section through the machine taken on theirregular line a-a, Fig. 2, lookingin the direction of the arrows andshowing the tens set of keys and the connections with their indicatorand counter elements. Fig. '2 is a longitudinal section of the machinetaken on the line 5 7), Fig. 1.

In the drawings 1 represents the end frames of the machine which areconnected by longitudinal bars 2, 3 and 4 near the front, bottom, andrear portions of the frames respectively, and by longitudinal shafts 5to 10 hereinafter more particularly referred to. Upon the shaft 5 arepivoted the key levers 11 through which the power for operating themachine is transmitted, and of which there are shown three sets of nineeach. The rear portions of these keys normally rest on the bar 3 andtheir rear ends are notched at 13 and curved at 11 for cooperating' witha key coupler rod 15 carried by arms 1G pivoted at 17 to the inner sidesof the end frames. Alongside the one key lever of each set is a link 18also normally resting on the bar 3 and notched and curved at its rearend like the corresponding ends of the levers 11 and for cooperatingwith the key coupler rod 15. The links 18 do not extend forwardly as faras the key levers 11 but their forward ends are loosely mounted on rods19, of which there is one for each set of keys. are supported at eachend by arms 20, the lower ends of which are loose on the shaft 5.Springs 21 connect at their ends with these links and with the shaft 7and normally hold the links rearward in the position shown.V The rods 19normally lie against the forward sides of hooks Q2 projecting upwardjust above the shaft 5 from the keys 11 and whenever a key is depressedat its forward end, through its hook 22 it carries the rod 19 and thezero link 18 of its set forward so that the rear portion 11 of the linkwill clear the key coupler rod 15 and allow the latter to be raisedwithout being lifted thereby. 1n case no key of a set is depressed tomove the link 1B of that set of keys forward as just described, the

key coupler rod when rocked upward by en- ,sagement in the notch 13 of akey in another set which is depressed will, by

with the lower end of the curved 1l vpist above the notch 13 of thelink, aise the latter which. lo co eratine" the These rods 19 steppedframes, returns the indicator unit of that set to indicate Zero in amanner hereinafter described.

The rear ends of the keys and links 1S cooperate with thecomplementarily stepped frames 23 and 2l larried at each end by arms Q5and 2G loosely mounted'at their forward ends on the shaft 5. Projections49 depend from the forward ends of these arms beneath the shafts 5 andnormally bear against the rear side of the shaft G which thus serves tosupport the arms and frames in the normal position showin These frameshave on their under sides ten graduated steps, one for each of the ninekeys and one for the link 18 of each set. They are'stepped complementaryto each other s that when a key or link is elevated against them frombeneath, the sum of the extents of movements of the two frames,considering steps as a unit, will always equal nine. The frames 23 arethe, ones which actuate the counter pinions and these arealways elevateddistances corresponding to their de pressed keys, while the rear frames21 are always elevated extents corresponding to the difference betweenthe number of steps their corresponding frames 23 move and nine. Theleft or nine key of a set will move its frame 23 upwardly nine steps andthe frame 21 none; the next or eight key moves the frame Q3 eight stepsand frame 21 one; the seven key moves the frame 23 seven steps and theframe 24 two, and so on. The link 18 is at the right of the units key ofa set and when elevated does not move the frame :23 at all but elevatesthe rear frame 21 nine`steps. lYhen the rear end of a key or link iscompletely elevated its upper side iS always in engagement withcorresponding complementary steps on the lower sides of both of theframes 23 and 24.

From the above description it will appear that the frames Q3 are alwayselevated dit'- ferentially in accordance with the keys depressed. Thisdilferential movementis used to actuate the counter pinions inaccordance with the keys depressed and to this end the left hand one ofthe arms 25 carrying thesi` frames have upward extensions 27 providedwith gear teeth. and by rocking the counter 28 cariied by arms :29pivoted on studs 30 of the machin(l frames downward to engage thecounter pinions 31 with the `ear teeth of the extensions 2, holding'them in engagement while the frame 23 and arm 25 are being elevated anddisengaging them before the return of the frames. the counter pinionswill be actuated differentially in accordance with the keys depressed.The means for engaging the counter with its actuators as 'well as thetransfer mechanism for it forms no part of the present invention and arecommon in the art and need not be described in. this a Liica'tion lltiThe frames 23'and 24 pivotally connect at 32 and 33 respectively withthe lower ends of links 34 and 35. These links respectively have pins 36and 37 at their upper ends which play in arcuate slots 38 and 39 ofindicator actuating disks 40 loosely mounted on the shaft 9. These disks40 have teeth 41 on a portion of their periphery meshing with pinions 42rigid with oscillatory indicators" 43 carried by longitudinal shaft 10whereby differential adjustment of the disks 40 similarly adjusts theindicators. The indicator actuating disks 40 also have notches 44 forcoperating with'pa-wls 45 mounted upon shaft` 8. and normally held inlocking engagement with the notches by springs 46 mounted between themand the longitudinal bar 4. The pawls 45 under tension of their' springsnormally hold the disks and connected indicators in vadjusted positionbut can yield to permit adjustment of the indicators when the machine isoperated.

The position of the indicators shown in the drawings is their zeroposition and that of the disks 40 -their normal position. With theindicators anddisks 40 in zeroposition pins 36 and 37 of the links restagainst the forward ends of their Slots 38 and 39. Upon depression of akey the frame 23 will be elevatedto an extent dependent upon the keydepressed and this frame. through its link 34 engaging the forward endof the forward slot 38 will swing the disk 40 clockwise to an extentcorresponding to the amount of elevation of the frame 23 and set theconnected indicator 43 accordingly. At the same time the link 35connected with the rear frame 24 is with its frame elevated an extentequal to the complement of the movement of the other frame and link andthis carries pin37 of this link, it being to the rear of the axis of thedisk while the pin 3G of the link34 is to the front ofthe axle, upwardlyand rearwardly in a direction reverse to the movement of the disk. Thisupward imovement of the link 35 is just suflicient to positively stopthe disk from clockwise movement at the moment the upward movement ofthe links is concluded. The slots 38 and 39 are of just suiicient lengthtopermit their pins having nine degrees of movement in them in passingfrom one end to the other. After the indicators and their actuatingdisks are adjusted the pawls 45 retain them in such adjustment while thelinks 34.

lower to higher positions, the links 34 in raising effect the movementby engaging the upper ends of the forward slots 38, the pins 37 on thelinks 35 serving then to positively limit their movement@ by. engagingthe rear ends of their slots39 at the moment of `completionof theadjustment of the indicators, while when theindicators are to beadjusted from higher to lower positions they yare moved in the reversedirection by pins 37 on the links 35 the complement of the extentsindicated'by depressed keys engaging the upper ends of the slots 39, thepins 36 on the links 34 in such cases serving to positively limit themovement of the actuating disks the moment "they reach positionsaccording to the keys depressed. The arrangement of the slots, links,and actuating frames is such that whenever any adjustment of anindicator is completed the pins 3G and 37 of its actuating-links arealways against the upper ends of their slots, and as these links are inopposite sides of the axis of the disks and are both moved upward, they.tend to impart movement to the diskin opposite directions with theresult that no further movement of the disks takes place in eitherdirection. f

It will be remembered that there are but nine keys'in a set, but 'thatan additional link 18 is provided which is elevated whenever the machineis operated and no key of its set depressed. This elevation of thelinks18 does not'elevate its frame 23 and link 34 but elevates its frame 24and link nine steps, which results in the complete elevation of the pin37 in its slot 39'to positively return its indicator disk 40counter-clockwise to carry its indicator to Zero if it had been leftotherwise by the preceding operation.

Front and rear indicators are provided in the machine as shown, thoseindicating at the front appearing at'the left in Fig. 2,

while the three right hand ones in this figure are for` rear indication.The two outside indicators are for the hundreds denomination and arecarried by the indicator shaft 10 which is rotated by a pinion 42mounted on the shaft near its left hand end and meshing with the gearteeth 4l on the indicator actuating 'disk adjusted by the set of keysfor the hundreds denomination. The shaft 10 loosely carries intermediatethe units indicators a sleeve 47 which carries near its ends the frontand rear indicators for the tens denomination. Adjacent the frontindicator near the left hand end of this sleeve, the latter rigidlycarries the pinion 42 engaging with the tens'denominations indicatoractuating disk. Surrounding the sleeve 47 between'its indicators isstill another sleeve 48 which carries at itsends the units indicatorsand adjacent the right one of these. is the pinion 42 meshing with theindicator actuating disk -for the'units`set of keys. By thisconstruction both the front and rear indicators are similarly adjustedwhen the machine is operated to indicate both at the front and the rear,the amount entered in the counter.

To operate the machine the proper keys of the necessary denominationalsets are slightly depressed to couple them with the key coupler byengaging their notches 13 over the `key coupler rod 15. The last key tobe depressed is forced all the way down which, through the elevation ofits rear end, completely raises the key coupler and through it thosekeys previously coupled with it by slight depression only. Thedepression of'a key in a set withdraws the zero link 18 lof that setfrom the path of the key coupler rod 15 to allow raising of the latterwithout aiiecting the Zero link. It no key in a set has been depressedthe zero link 18 of the vset is left in rearniost position and elevationof the key coupler by depression of Aa key in another set will elevatesuch link.

The elevation of the rear ends of the keys and links raises the steppedframes, the counter actuating one always in direct proportion to thevalue of the depressed keys, and this upward movement of this frame :23through the gear teeth on the extension Q7 accordingly actuates thecounter. The frames Q3 and 2l through their links34- and 35 serve to setthe indicator disks directly from one position to another, the formerpositively moving the disk to set `the indicator from lower to higherpositions, and the latter positively moving the disks in the reversedirection when the indicators are moved from higher to lower positions.`When one of the links actually moves the indicator actuating disk theother moves suiiiciently to position its pin so that at the moment thefirst mentioned link completes its adjustment of the indicator disk `thepin of the other engages kwith the Yupper end of its slot in the diskand prevents further movement of the disk. The weight of the key couplerand the sets of frames is sufficient to lower them and the rear ends ofthe keys to restore the keysA to. operable position. i

Thilo the `form of mechanism herein shown and-described is admirablyadapted to fulfil the objects primarily stated, it is to be understoodthat it is not intended to confine the invention to the one forni ofembodiment herein shown and described. as it is susceptible ofembodiment in various torms. all coming w-ithin the scope ot the claimswhich follow.

"What is claimed is:

1. In a cash register, the combination of a totalizer; actuatorstherefor, indicators. actuators for the indicators, the totalizeractuators and indicator actuators performand totalizer.

2.'In a cash register, the combination of a counter pinion; adifferentially movable frame for. actuating the same; an indicatorconnection from the frame to the indicator whereby the former may setthe latter; andv differentially movable means for positively preventingfurther movement of the indicator after it reaches the positioncorresponding to the differential movement of the frame. y

3. In a machine of the class described, the combination ot a counter adifferentially movable counter actuating frame; a second differentiallymovable traine; means for actuating the frames to complementary extents;an indicator; and connections between the frames and the indicatorwhereby the latter is adjusted to indicate the extent of movement of thecounter actuating frame by.moving directly from one position vtoanother. f

In a machine of the class described, the combination of a plurality ofmovable frames; a series of keys for actuating the same; steps on theframes,complementarily arranged for cooperating with corresponding keysfor actuation to complementary extents thereby; an indicator; andconnections whereby the movement of the frames can adjust the indicatorin opposite directions. the direction of movement of the indicator bythe connections being dependent upon the position of the indicatorbefore the beginning of the operation.

5. In a machine of the class described, the combination of a pluralityof complementarily stepped movable frames; a series of operating meansfor the frames for engaging complementary steps on them to actuate theframes diiierentially; an indicator actuating disk; and oppositelyeffective one way driving connections between the frames and the diskfor adjusting the indicator from one position directly to another.

6. In a machine of the class described, the combination of a pluralityof complementarily stepped movable frames; a series ot operating meansfor the frames for engaging complementary steps on them to actuatc theframes diiferentially: an indicator actuating disk having a plurality ofarcuate llt? 7. lIn a machine of the class described, the combination ofa diiierentially movable frame; operating mechanism therefor; a secondframe adapted to be moved by the operating mechanism to extentscomplementary to the movements .of the first mentioned frame; indicatingmechanism; and connections between the frames and the indicatingmechanism whereby the irst mentioned frame adjusts the indicatorfrom'lower to higher positionsl and the -last lmentioned frame adjustsit from higher to lower indicating positions. 8. In a machine of theclass described, the j combination of a differentially movable frame;operating mechanism therefor; a second frame adapted to be moved by theoperating mechanism to extents complementary to movements of the irstmentioned frame; and connections whereby either the rst mentioned frameadjusts the indicator from lower to higher position to indicate theextentof movement of the frame, or the second mentioned frame adjuststhe indicator from higher to lower position to indicate the extent ofmovement of the iirst mentioned frame.

9. In a machine of the class described, the

combination of a 'diferentially movable frame; operating mechanismtherefor; a second frame adapted to be moved by the operating mechanismto extents complementary to movements of the first mentioned frame;l anindicator; an actuating disk therefor; connections between the firstmentioned frame and the indicator actuating disk for moving the latterin one direction; and connections between the other frame and theindicator disk for moving said disk in the opposite direction, theeffectivity of the connections upon the disk being determined bythe-,position of the disk at the beginning v of the operation and theposition it is to occupy at the end ofan operation.

10. -In a machine of the class described, the combination of anaccounting mechanism; a plurality of devices connected thereto foroperating the accounting mechanism in opposite directions effective onthe accounting mechanism in one direction of their movement only; andmeans for moving the devices to complementary extents to adjust theaccounting mechanism from one position directly to another.

11. In a machine -of the class described, the combination of anaccounting mechanism; a plurality of devices connected thereto foroperating the accounting mechanism in opposite directions effective onthe accounting mechanism in one direction of their movement only; andmeans for moving the devices to complementary extents to adjust theaccounting'mechanism from one position directly to another, the devicenot serving to adjust the accounting mechanism nections between thedevices and the accounting mechanism whereby either may adjust theaccounting mechanism to a position corresponding to the depressed keywhile the other serves as a stop to prevent .movement of the accountingmechanism beyond its desired position.

13. In a mechanism of `the class described, the combination ofaccounting mechanism; manipulative mechanism; and a plurality of deviceshaving a normal position and connecting said mechanisms for yactuatingthe former from the latter and for limiting such actuation, one of thedevices serving to limit the actuation of the accounting mechanism whenthel other is actuating it.

14. In a machine of the class described, the combination of an actuatingdisk for accounting mechanism having a plurality of arcuate slotstherein; pins mounted in the slots and normally separated angularlyabout the axis of the disk by a constant angle; and means for changingthe angular distance between the pins to set the accounting mechanism.

15. In a machine of the class described, the combination of a pluralityof indicators; a plurality of sets of keys for operating the same; a keycoupler and connections whereby it is coupled with the keys by a slightdepression of the latter; a zero bar for each set normally coupled withthe key coupler whereby operation of the key coupler by a key of anothersetwill operate the zero bar tol restore its indicator to zero; andmeans whereby the depression of a key of a set disconnects the zero barof such set from the key coupler. i

16. In a. machine of the 'class described, the combination of a mainoperating mechanism an indicator; aseries ofv keys for adjusting thesame; a member normally in position to restore the indicator to zeroupon the operation of the operating mechanism; and means whereby themember is withdrawn from normal position when the indicator is to beadjusted by the depres.v

sion of a key in the series.

, angular extent; and means for changing the` the combination of a mainoperating mechanism, an indicator; a series of keys for controlling theadjustment of the same to indicate other than Zero; connections wherebythe indicator is adjustedto indicate zero when the operating mechanismis operated without the depression ot' a key; and means whereby theconnections are disabled when a key is depressed and the indicatoradjusted in accordance with it.

19. In a machine ot' the class described, the combination ot a pluralityof indicators; a plurality of sets of keys for adjusting the indicatorsto indicate other than zero; means for adjusting the indicators to zerowhen the machine is operated without the depression ot' a key in theircorresponding set; and means whereby the depression of a key to setanindicator disables the last mentioned means for that indicator.

20. In an indicating mechanism, the combination ot' an indicator; meansfor adjusting the latter from one position directly to another; a seriesof keys for differentially operating said means; connections foroperating said means' to adjust the indicator to zero position when themachine is operated without the depression of a key; and

projections carried by the keys for disabling the connections when thekey is depressed.

21. Iny an indicating mechanism, the conibination of an indicatoractuating disk; a plurality ot links connected thereto for rotating thedisk in either direction to adjust the latter from one position directlyto another; a series of keys'for moving the links diiferentially andcomplementary to each other; a zero bar adapted to operate the links torestore the indicator disk to zero when the machine is operated Wit-houtthe depression of a key; a pivotally supported rod connected with-thezero bar and passing overthe keys; and projections on the keys 'forengaging. the rod when a key is depressed for moving the bar to renderit inoperative when the indicator is to be` adjusted by the depression.of a key.

22. In an indicating mechanism, the combination of an oscillatoryindicator actuating disk provided with arcuate slots; a plurality oflinks having pins Working in said slots and normally separated aconstant angular distance between the ,pins to a constant extent at eachoperation to adjust the indicator, the linal adjustment of the samedepending upon the relative extents of movement of thepins on the links.

23. In an indicating mechanism, the combination of an indicatoractuating disk; a plurality of` links connected therewith but movablerelatively. thereto; and key controlled means for changing to a constant-extent at each operation the angular distance between the points ofconnection of the links with the disk, the construction being such thatthe links are given various relative extents of movement d ependent uponthe keys depressed, to determine the final adjustment ot' the indicatorand the direction in which it lnoves in its adjustment.

2l. In a cash register', the combination of a counter pinion; adifferentially movable frame for actuating the same; an indicator;connections from the frame to the indicator whereby the former may setthe latter; and differentially adjustable means for positively limitingthe adjusting movement ot' the indicator when it reaches the positioncorresponding to the differential movement of the frame.

25. In an accounting machine, the combination of a series of keys; anindicator; and a plurality of connections between the keys and theindicator, movable differentially and independently by the keys, foradjusting the indicator and limiting its movement. the constructionbeing suoli that when either of the connections adjusts the indicatorthe other limits the movement of the latter'.

26. In a machine of the class described, the combination of anaccounting mechanism: a series of keys; a plurality of devices movabledifferentially by the keys and complementary toeach other; pin and slotconnections between the devices and the accounting mechanism wherebyeither may adjust the accounting mechanism to a position correspondingto the depressed key while the other serves as a stop to preventmovement beyond its desired position, the pin and slot connections beingconstructed to permit the differentially movable devices to be returnedto normal position; and means 'for locking the accounting device inadjusted positions.

27. In a machine of the class described, the combination of an actuatingdisk 'for accounting mechanism and having a plurality of guidingsurfaces; pins mounted in coperative relationship with said guidingsurfaces; links carrying said pins and nora mally nearly parallel; andmeans for bodily 'them and then moving the same differentially; andconnections ybetween the frames and the indicator for moving thelatter.

29. In a machine of the class described,

the combination with a plurality of complementary stepped movableramesgan indicator; operating means for engaging all of said frames andmoving them difierentially while in engagement therewith; an indicatoractuating disk; and connections between the'frames and the disk foradjusting the indicator from one position directly to another uponmovement of said frame.

30. In a machine of the class described, the combination with anindicator, of a bank of keys for each indicator, a pair of elements foreach bank of keys arranged to be given complementary differentialmovements by operations of the keys, connections whereby the movement ofone element will differentially drive the indicator and the movement ofthe other element will differentially move a stop for the indicator.

31. In a machine of the class described, the combination of a pluralityof complementa rily stepped movable frames, a. series of operatingdevices arranged to engage complementary steps on the frame to operateboth frames differentially, an indicator, an indicator actuator, andoppositely eiiective connections between the frame and the actuator, oneconnection moving the indicator directly lfrom its position of previousadjustment to the desired position and the other ypreventing movement ofthe indicator past said desired position.

32. In a cash register, the combination with an accounting element, anddual means operable singly to actuate said accounting element, said dualmeans being so constructed that each of said means will act to limit theactuation of said element when the other of said means is actuating saidelement.

In a cash register, the combination with an accounting element, and dualmeans operable singly to actuate differentially said accounting element,said dual means being so constructed that either o'f said means will actto limit theaetuation of said clement when the other of said means isactuating said element.

34. In a machine of the class described, the combination with aplurality of indicators, of a set of depressible keys for eachindicator, a pair of 'elements for each set of keys arranged to be givencomplementary ditferential movements by operations of the keys,connections whereby said movements will differentially move theindicator in either direction and positively limit the eX- tent ofmovement, and other connections whereby depressing a key in any one setwillI position the indicators of the other sets at Zero.

35. In a machine of the class described, the combination with aplurality of indicators, of a `set of keys for each indicator, means forcoupling together for simultaneous operation keys of different sets,said means being given an invariable extent of movement at eachoperation, and means whereby said coupling means will vposition at Zerothe indicators for the sets in which no key has been connected to thecoupler.

36. In a machine of the class described, the combination with aplurality of indicators, of a bank of keys for each indicator, a pair ofelements for each bank of keys arranged to be given complementarydifferential movements by operations of keys in the bank, connectionsbetween each element and the indicator whereby the movement of oneelement will diiierentially move the indicator and the movement of theother element will differentially move a stop for the indicator, anelement given an invariable extent of movement when the machine isoperated, and means automatically coupling one of the aforesaid elementsto the invariably moved yelement when no key in a bank is depressedwhereby to set the indicator for that bank at zero.

37. In a cash register, the combination of a totalizer, actuatingmechanism therefor, indicator actuating mechanism, and connectionswhereby the indicator actuating mechanism prevents both overthrow andrebound of the totalizer actuating mechanism and totalizer.

38. In a cash register, the combination of a totalizer, actuatingmechanism therefor, indicator actuating mechanism, and oppositelyeffective connections whereby the indicator' actuating mechanismprevents both overthrow and rebound of the totalizer actuating mechanismand totalizer.

In testimony whereof I affix my signature in the presence of twowitnesses.

THOMAS MIDGLEY, JR.

Witnesses:

VILLIAM A. LINN, CARL Bauer.

